Major Suit Responses & Conventions

When partner opens 1H/1S remember that new suits are forcing, requiring partner to bid again, and raising partner or bidding notrump is not forcing. These are your general strategies for what to bid...

0-6 HCP - Pass!
6-9 HCP - Raise partner w/ support for partners suit, or bid 1N w/o support for their suit.
10-12 HCP - Jump raise partner w/ 4+ card support, bid a new suit at the two level, or bid 2N when balanced w/o support. (unless you are playing Jacoby 2N.)
12+ HCP - With support for partner start by bidding a new suit at the two level and then jump raise partners suit.

Example of basic bidding if Partner opens 1S (bidding is similar if partner opens 1H)
1N = 6-9 HCP, 0-2S
2C = 5+C, 10+ HCP
2D = 5+D, 10+ HCP
2H = 5+H, 10+ HCP
2S = 3-4S, 6-9 HCP
2N = ??? 10-12 HCP, 0-2S  (Unless you play Jacoby 2N) ???
3C = ??? Jump Shift (Strong or Weak - can be played either way) ???
3D = ??? Jump Shift (Strong or Weak - can be played either way) ???
3H = ??? Jump Shift (Strong or Weak - can be played either way) ???
3S = 4S, 10-12 HCP
3N = 13-15 HCP, 0-2S
4C*= ??? 4+S, 11-14 HCP, Singleton or Void in C, Splinter
4D*= ??? 4+S, 11-14HCP, Singleton or Void in D, Splinter
4H*= ??? 4+S, 11-14 HCP, Singleton or Void  in H, Splinter
4S = 5+S, 5-10 HCP, no slam interest
4N = Blackwood (Asks partner for aces - could be Keycard.)

<>Other conventions are commonly played in response to partner's major suit opening, these must be discussed with partner before you play: (common conventional bids are marked ??? above.)
1N Forcing - When partner opens 1H/1S and you bid 1N it is artificial and forcing for one round. This shows 6+ HCP, but is unlimited. Opener is required to bid again and further describe their hand. Responder will then be in a good position to describe their hand.
Jacoby 2N - A bid of 2N in response to a major suit opening shows, 4+ card support for openers major, 12+ HCP and is forcing to game. It asks the opener if they have a singleton or void and it is a useful convention for investigating slam without using Blackwood and bidding beyond game.